Stop-motion for engines.



No. 646,636. v Patented Apr. 3, I900.

' H. F. ORIOKLER.

STOP MOTION FOR ENGINES.

(Application filed Aug. 2,-1899.) (No Model.)

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No. 646,636. Patented Apr. 3, i900.

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STOP mono" FOR names. 7

. (Application filed Aug. 2 1889.) (No Model.)

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No. 646,636. Patented Apr. 3, 1900.

' H. F. CRICKLER.

STOP MOTION FOR ENGINES.

- (Application filed Aug. 2, 1899.) (No Model.) 4 Sheets-Sheat'4.

ITED V STATES PATENT OFFICE.

HARRY F. ,ORIOKLER, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR or Tl-IREE-FOURTHS TO EDMUND K. BAKER, WILLIAM G. MEADE, AND WILLIAM H. GRAY, oFsAME PLACE.

STOP-MOTION FOR ENGINES.

sPEoi-F'IoATIoN forming part of. Letters Patent No. 646,636, dated. April 3, 1900.

- Application filed August 2, 1899.

To all whom tom/cry concern:

Be it known that I, HARRY. F. ORIoKLnR, a I citizen of the United Statesof America, and a resident of Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Stop-Motions'an'd Speed-Limits for Engines and other Machinery, of Whichthe following is a full, clear, and exact descripcontrols the starting and stopping of any machine. v V

This invention consists in anovel stop motion orrmechanism adaptedto be operated by the closing of an electric circuit, whereby the comprised armature adjacent an electromagnet which is connected in a'c'ircu'it and which armature has a detent engagement with a weighted member of the mechanism becomes released, leaving the weighted member free to descend, the force developed by the descending weightbeing utilized to actuate mechanically devices for stopping the engine or the controller of any motive power or for actuating the stopping or shipping devices of any, mechanism or machinery.

The invention furthermore consists in the combination, with the mechanism aforementioned, (comprising, essentially, the weight and the novel devices cooperating therewith, which maintain it in an elevated position, which insure its liberation for descent, and

which after an operation of the mechanism and descent of the weight restore it to its elevated position in readiness to be again operated,) of appliances operated thereby and which are especially devised for cooperation with the latch-links or grab-hooks of a steamengine of the Corliss or other similar type, so that when the mechanism has been freed by the releasing movement of the armature of the eleotromagnet comprised therein the said appliances will assume such positions as to Serial No. 725,860. (No model.)

' prevent the valve-operating actions ofthe grab-hooks.

The invention furthermore consists in the combination, with stop-motion mechanism, of an engine which may be of any suitable description of a novel construction of speedlimit?-that is to say, a device operatively applied so that the stop-motion may be autom'atically operated by reason of'any abnormal speed conditions developed by the run ning of the engine.

I The invention also consists in constructions, combinations of parts, and appliances, all substantially as hereinafter fully described, and set forth in the claims. A I

Reference is to be had to the accompanying drawings, in'which all the departments of thisinvention are illustrated, and in which- Figure 1 is an elevation taken at the front side of the cylinders of an ordinary Corlissv or analogous type of steam-engine, showing the usual mechanism which operates the steaminlet .(and also the exhaust) valves and the combination therewith or application for use in relation thereto of the present new stop mechanism and also of the improved speedlimit. Fig. 2 is a central vertical sectional view through the portion of the stop mechanism which comprises the power-weight thereof and the supporting, detaining, and releasing means therefor and the resetting device, to-

gether with a portion of the connections bined therewith novel devices to be actuated by the power element of this novel stop-motion, shown in Fig. 2, and in turn serving when operated to render the grab-hook inoperative for its opening actions on the steamadmission valve, and this viewalso shows a speed-limit. Fig. 7 is a side elevation of the same devices which are shown in front elevation in the preceding view. Fig. 8 is a perspective view in detail of a supportingbracket to be hereinafter referred to. Fig. is a perspective view of the devices shown in Figs. 6 and 7.

I will first describe that department of the invention comprising the power elementheld in suspension and its detaining and liberating means, which power element when liberated mechanically and forcibly imparts a movement to a lever, thrust-rod, or other medium of connection, it being understood that such forcibly-imparted movement may be utilized in a great many different ways for useful purposes, and which, as shown in the drawings here provided, operate appliances provided in conjunction with the latch-link or grab-hook devices of the valve mechanism.

In the drawings, A represents acasing comprised in a hollow standard, which advantageously may be of a general cylindrical form and in which is fitted for free vertical movement the weight B, which is of considerable bulk and preponderance. The weight is provided with the upwardly-extended axial stem a. The said casing A, at its top, is provided with the disk-like wall I), having the central screw-tapped aperture 12, in which is screw-engaged the bushing d, the same being enlarged above its screw-threaded portion, which is fitted with a screw engagement in the aforesaid tapped hole of the casing-top, is externally of the form of a frustum of a cone, is formed with a round axial hold or bore leading from end to end, and in its conical portion is provided with the several pockets or transverse perforations f. Surrounding and separated from the conical upstanding part 01 of said bushing is the annular wall g, between which and the said upstandingpartis the annular space downwardly c011- tracting from the open upper mouth. The upwardly-extending stem a of the weightB plays upwardly-within said centrally-bored part d and has at its upper extremity the neck a and the head a".

i represent hardened-steel balls provided for rotation and free rolling movement, when permitted, in the aforesaid pockets f of the upstanding part (Z.

j represents an annular restraining-shell comprising top 13, with central upstanding hub 14 and the depending annular hollow hub-like portion 15, externally cylindrical, but internally formed with the opening therein of frusto-conical form, said opening downwardly flaring and corresponding with the external surface of the aforementioned upstanding part (1 of the bushing. This restraining-shell j, when forced downwardly, exerts an inward-crowding action on the balls i, so that they are forced to protrude within the bore of the part (I and while so restrained serve to support by the head a thereof the weight-stem a.

The portion of the upstanding externallytapered round part d has a thickness of wall through which the pockets f are transversely formed less than the diameter of the balls, so that when the outer sides of the balls are flush, or approximately so, with the outer surface of the upstanding conical part comparatively considerable portions of their bulk will protrude inwardly-to give sufficient width of bearing engagement for the shouldered head of the weight-stem.

The casing A of rectangular form, is provided upon the top of and supplemental to the casing A, the same inclosing the parts (1 g, andj and also inclosingthe electroinagnets O O, the armature D, and the latch-lever E. The latch-leveris intermediately of its length, at 16, pivotally mounted in the depending ear-pieces 17, provided at the upper part of the supplemental casing A,- the shorter arm thereof being over the center of the aforementioned restraining-shellj, while the longer arm of said lever is adjacent to the latch-like end 18 of the depending arm D of the armature, and when the armature is in its normal positionthat is, away from the magnet-the detent member 18 will be in restraining engagement with the long arm of the aforesaid latch-lever.

20 represents a vertically-adj ustable screwrod, screw-engaging into a tapped socket therefor in the npstandinghub portion of the restraining-shellj, said screw-rod having combined therewith the lock-nut 22, and this upstanding rod 20, when the mechanism is set in readiness to be operated by the closing of a circuit and the energizing of the electromagnet, is engaged by the short arm of the latch-lever E, so that the restraining-shellj is prevented from rising.

The electromagnet O is comprised or connected in a normally-open circuit constituted by the wires 24 and 25, one thereof having connected therein the battery 26, and this circuit is adapted to be closed by the pushbutton 27, the electromagnetic circuit and its closing devices being the same as commonly employed in electrically-operated stopmotions of the general class to which this invention appertains.

The weight has an upstanding lug or car 30, the same being firmly united, as by being formed integral with the stem 32, penetrating through to thebottom of the weight, andhaving its lower end shouldered, as at 30, which lug has the projecting stud 34, engaged through the curved slot of the arm 36 of the two-armed lever F, and to the other arm 37 of this lever F is connected a thrust-rod, which thrust-rod and said lever constitute the medium of transmission sufiiciently foreibly of the motion which the weight 13 has in falling, and this motion may be made available for useful purposes in an infinite number of ways, it being understood that the pressure on the button 27 to close the circuit causes the attraction of the armature C, which in swinging to the magnet carries the detent member 18, which is constructed as a part thereof, out of the restraining engagement with the latch-lever E,so that the restrainingshell j may rise, whereby the ballsc' 1' will, by the shouldered head of the weight-stem, be crowded out of the way of said headed part of the stem, leaving the weight free to fall.

The provisions for the resetting of the abovedescribed mechanism will be now pointed out and explained. v

Beneath the weight is the arm 40 of the footlever H, pivoted at 42 in ear members of the upright casing A, the member 43 of this lever being external of the casing.

m represents a thrust-rod, the same being guided and playing through a vertical hole 44 therefor in the top?) of the casing A, and the lower end ofv this thrust-rod m rests upon the top of the weight B. V The upper end of this thrust-rod m'is normally below the lower edge of the long arm of the latch-lever E, was to be out of the way of such lever, whereby the latter may swing downwardly whenliberated. Now the weight having been liberated and fallen as low as represented by the dotted line w in Fig. 2, the foot-leveris employed to elevate it, not only to its height shown'by full lines in Fig. 2, but momentarily up to the height indicated by the dotted lines y, so that the thrust-rod will swing the latch-lever E to move its long arm upwardly and to be latched by the armature-detent and. to further exert through such swinging motion'of the latchlever the downward crowding-by the short" arm of the latch-lever of the restrainingshell, whi ch, wedging down between .the balls 2' andthe surrounding wall g,-crowd's the balls inwardly and insuresin such position the retention thereof, so that on then easing up on the foot-lever theweight may come to its position positively shown as supported to the shouldered top end of its stem on the balls.

In this mechanism as I have constructed it and which is illustrated in conjunction with this description the downward-crowding 'action exerted by the heavy weight B on the balls outwardly exerts when the latch-lever is released against the inclined inner side of the restraining-shell j anelevating pressure on the latter, while, on the other hand, as al' ready mentioned, the downward pressure on said shell crowds the-balls inwardly. I have, however, shown the spring is exerting an elevating pressure on the restraining-shell which may be employed; but I prefer to dispense withit and have dispensed with it, as the mechanism is operative in the absence thereof.

While, as aforementioned, the mechanism which has been described in detailis not limited to its use in conjunction with the valve operating and controlling devices of a steam-engine, I have used it in conjunction therewith and, as shown in Figs. 1,6, and 9, have devised especial appliances to cooperate with the latch-link or grab-hook mechanism, and the last-mentioned appliances will connecting-rod M which is also hung in the usual way to the wrist-plate or rocker N, to which the rocking reciprocatory motion isimparted by the eccentricr-od O, which is operated by the eccentric, as well known, on the crank-shaft of the engine.

P represents the latch-link or grab-hook,

which is hung on one of the armsof the bell-' crank M, the same having the hook or shoulder 0 to engage the aforementioned'block n of the crank-shaft lever, and this appliance also has the arm 25, which liesas held'by the spring 25 in bearing against the periphery of the trip-collar Q, which collar is loose about the valve-shaft and is-formed with theiradial arm Q with which is connected-the reachrod Q extendingtheret'o from the governor.

Now I provide as a new device, in conjunction with this grab-hook mechanism last referred to and which is well known, a device operated by the thrust from any power element to cast off the grab-hook and render it inoperative to rotate the steam-admission valve, as follows: I v u represents a clamp-r ng to encircle the too journal-hub J of the engine through which the valve-shaft extends, the same comprising the ear member 48 and the second ear member 4.9, with the dependinglug 50. Pivoted at 51 to the ear 48 is the link 2;, having atits lower end the forwardly-standing hollow hub 12?.

' 57 is a tongue having its circular or hublike upper end portion provided with a comparatively-long, rigidly-aflixed, right angularly-extending, stud 60,7which is journaled through the hub 11 and has on its projecting forward end the guard or cast off rod w which is extended into proximity to, but normally separated from, the edge of the tripring Q or other circular portion on which the grab-hook member If rides. Said part 57, engaged with the hub end of the lever 01, as mentioned, also has a projection coincident with the stud 60, (and which may be a part of said stud,) engaged loosely through the slot53 in the aforesaid bracket to.

The bell-crank r is at its elbow pivoted, as seen at 55, to the lever-lug 50 of the bracketring u, its upper end being forked, as seen at 56, and receiving engagement therein of the depending tongue 57. Now when the stopmotion is operated, impartinga given length of thrust to the lever G, which is pivoted to said bell'crank r, the swinging motion of the latter imparts, first, a swinging motion of the tongue 57 and rocking motion of the stud 60, which causes the rod to to be swung with its extremity in contact on the trip ring or part Q of the valve mechanism over which the heel or arm 75 of the grab-hook rides, and then, secondly, abodily movement of the said tongue 57, its stud, and the guard-rod w, as constrained by the depending member 7/ and the projection coincident with the stud which is engaged through said slot 53, so that such arm twill, as it rides in its back-and-forth motion, be crowded outwardly by the curved extremity of the rod to, which constitutes a cam-like guard for this purpose. The reason of the means which imparts initially the swinging motion through the tongue, the rocking of the stud and corresponding swinging of the cast-off rod 20, and thereafter the bodily motion of these parts whereby the rod w moves around to lie well within the path of movement of the grabhook member 25, is so that the device will have its proper capability for the throw-01f action of the grab-hook for which it is primarily designed and yet normally have such position (shown in Fig. 6) as to constitute no obstruction to the trip projection ,2 of the trip-ring Q, whereby on occasion this projection may itself (instead of member 10) assume the casting-off position in relation to the grab-hookthat is to say, when the speed of the engine becomes so excessive that the reach-rod Q is by the governor so far forwardly forced that it, through the lever-arm Q places the trip-ring in the position to cast off the grab-hook.

R represents the speed-limit applied in re- 7 lation to the Valve mechanism to close the circuit should the engine start to race or run away with itself or develop an abnormal speed, whereby the stop-motion will be operated the same as if the push-button were pressed and with the same eifect. The speedlimit comprises the bar or member 70, having its hub fixed on the small shaft or rod 72,

'which is rotationally adj ustably mounted in the hub or enlarged end 73 of the rod 74., which in turn is adjustable as to its length through the transverse socket 75 of the hub 76 on the rod 77, supported upstanding above, but insulated from, the clamp-ring u. The bar is in proximity to the trip-ring crank Q not, however, to be contacted thereon, except the governor of the engine is excessively moved, whereby through the reach-rod the crank Q would be thrown over into its unusual position, so as to contact on the bar 70. This speed-limit comprising the said bar 70 is in electrical connection by the wire 78, Fig. 1', with the stop-motion circuit, and the trip-rin g crank Q is also, through the metallic parts of the engine and as further continued by the wire 79, in connection with the stop-motion circuit. When the engine starts to race, the trip-ring crank Q then being swung so far as to contact with the blade or member 70 of the speed-limit causes the establishment of the stop-motion circuit, whereby the clectromagnet becoming live causes the operation of the stop-motion and the interposition of the cast-01f guard to to prevent the grab-hooks from performing their ordinary valve-shaft-rocking actions.

The speed-limit is vertically adjustable and the contact-blade 7 O is bodily adjustable along the rod 72, which, it will be seen, is adjustable in a line parallel with the crank-shaft, all whereby the speed-limit may very readily, be properly mounted to be cooperated with by the trip-ring crank and whereby, especially, the member 70 may be near or closer said crank, so that contact may be earlier or later, as predetermined.

It will be noted that the hub 73, in which the rod 72 may partially rotate, has the slot 80, in which is the pin 82, radially extended from the rod 72, which serves to limit the quadrantal swinging motion of the speedlimit blade or contact member.

When the engineer leaves the engine, he swings the speed-limit down to the position shown in Fig. 9; but when he remains about the engine he swings the speed-limit out of its cooperative relation to the crank Q because when present he can detect the tendency of the engine to race and personally regulate the engine without the stoppage thereof, which latter is provided to be done automatically in exigency during his absence.

Having thus described my invention, what I claim, and desire to secure by Letters Patcut, is-- 1. In a stop-motion, a power element, as a weight, having a headed or shouldered sustaining member, a centrally-apertured part Within which the said headed sustaining member is movable constructed with one or more pockets opening inwardly, balls in said pockets, a restraining device for normally holding the balls in their positions of supporting engagement for and relatively to the shouldered weight-sustaining member, an electromagnet connected in a suitable circuit and having an armature in detent engagement with the restraining device, and a mediumof transmission adapted to be operated by the released weight, for the purpose set forth.

2. In a stop-motion, the weight having an upwardly-extended stem with a shoulder, the centrally-apertured part within which said shouldered stem is movable, and constructed with radial pockets or apertures ff opening inwardly and also to the exterior of said part, balls in said pockets, a restraining device arranged externally of said centrally and radially apertured part for normally holding the balls in positions of supporting engage ment relatively to the shouldered stem, and electromagnetically-actuated detcnt devices for preventing and insuring as required, the liberation of said ball-restraining device, for the purpose set forth.

3. In a stop-motion, in combination, the centrally-bored part dhaving the radial pockets opening inwardly to the central bore and balls in said pockets, the weight having the IIC shouldered stem.

4. In a stop-motion, in combination, the centrally-bored part 61 having the radial pockets opening inwardly to the central bore and balls in said pockets, the weight having the stem provided with a shoulder adapted to play through the central bore of said part and to be sustained by the inwardly-restrained balls which protrude into the bore and engage under the shoulder, means for restraining the balls in their inward disposition, means operative to release the restraining device to permit the balls to be disengaged from the shouldered stem, and a device elevating the weight after an operation of the mechanism, whereby the shoulder of its stem resumes its position to be engaged for support by the balls.

5. In a stop-motion, in combination, the centrally-bored part 01 having the radial pockets opening inwardly to the central bore and balls in said pockets, the weight having the stem provided with a shoulder adaptedto play through the central bore-of said part and to be sustained by the inwardly-restrained balls which protrude into the bore and engage under the shoulder, means for restraining the balls in their inward disposition, means operative to release the restraining device to permit the balls to be disengaged from the shouldered stem, a device for, elevating the weight after an operation of the mechanism, whereby the shoulder of its stem resumes its position to be engaged for support by the balls, and mechanism operated by the weight-elevating device for insuring the resumption of the restraining device in its position for maintaining the balls inwardly crowded, and retained in their engagement with the shoulder of the weight-stem.

6. In a stop motion, a weight, balls and ways or guides in which the same are inwardly and outwardly movable whereby they may have weight-supporting positions and engagements relatively to the weight and positions of release therefrom, a movable part adapted to impinge against the balls and to crowd and restrain them into the weight-engaging position, a detent device for said movable part for holding it in the ball-restraining position, means for liberating the detent device, and a medium of transmission adapted to be operated by the forcible movement of the weight.

7. In a stop-motion, a weight, constituting a power element movable supports therefor; restraining means movable to force, and hold, the supports in the weight-engagin g position, and comprising a detent; a medium of transmission deriving forciblejmotion from the descent of the weight; a weight-elevating device; and a device arranged to be operated by the elevation of the weight to operate and hold engaged, the aforesaid restraining mechanism, substantially as described.

, 8. In a stop-motion, a weight, movable supports therefor adapted to engage and disengage same, a restraining member to force, and adapted to hold, the supports in the weightengaging position, and having combined therewith a latch -lever, an electromagnet having its armature serving as a detent with which said lever has a latching engagement, means for insuring the elevation of the weight, a device operating in unison with the elevation of the weight for swinging the latch-lever, whereby it both actuates the said restrainer, and assures engagement with the armature-detent, and circuit connections for said electromagnet comprisinga generator.

9. In a stop-motion, a weight, movable supports therefor, restraining means cooperating as described with the said supports, the latchlever combined in the restrainer, a detent adapted to engage the latch-lever, a weightelevating device, a rod applied between the weight and the latch-lever serving on the raising of the weight to swing the latch-lever for insuringby such lever the resetting operation of restrainer and the rengagement of the detent with such latch-lever, means for releasing the detent, and a medium of transmission actuated by the released weight,

10. In a stop-motion,a weight provided with the upstanding stem,having the head or shoulder a the centrally-apertured part d within which said stem plays being externally of conical form and provided with the transverse apertures, the balls, the surrounding annular wall g and the restraining-shell j, having its internal wall flaring downwardly, the latchlever E, electromagnet having an armature cooperating as a detent with the latch-lever, a circuit in which the electromagnet is connected, and a connection for the transmission of the force developed by the descent of the weight.

11. In a stop-motion, the combination with the weight, means for the suspension and means for effecting the liberation thereof, the lever F pivotally mounted adjacent the weight and having the curved slot 35, and a member provided on. the weight engaged in said slot.

12. In a stop-motion, the hollow standard or upright casing A having an aperture 9 through its side, and having a cylindrical weight vertically movable within said casing, movable means adapted to have imparted thereto positions whereby they engage said weight for supporting the same elevated, and means cooperating therewith for the disengagement thereof, the lever F intermediately pivoted on said casing adjacent said aperture, and having the slotted arm 36 inwardly extended and the outwardly-extended arm 37, and the upstanding ear or lug provided at the top of the weight and having the stud 34 engaged in said slot of the lever-arm, substantially as described.

13. In a stop-motion, in combination, the casing A having the apertures 8 and 9 through its side, the weight B, weight sustaining and liberating mechanism, the lever F pivoted at the side of the casing and having the slotted arm 36 extended through said aperture within the casing above the weight, and having also the outwardly-extended arm 37 and an operating-arm Gconnected therewith, the upstanding projection 30 above the weight and the stud engaged through the slot of the arm, the lever H pivoted-on the casing adjacent the aperture 8 having the inwardly-extended arm 40 beneath the weight and having the outwardly-extended pedal member 43, substantially as described.

14. In a stop-motion, the combination with the casing A having therein the weight B, provided with the upwardly-extended shouldered stem, the part d having a central bore having its exterior conical and provided with the transverse apertures, the balls therein, the surrounding annular wall g and the restraining-shell j having the conical-formed opening therein, of the latch-lever E, electromagnet and armature-detent, and a transmission medium operated by the descent of the liberated weight, for the purpose set forth.

15. In a stop-motion, the combination with the casing having therein the weight B, having the shouldered stem a, the part (Z having a central bore, having its exterior conical and provided with the transverse apertures, the balls therein, the surrounding annular wall g, and the restraining-shell having the conical formed opening therein, of the latch-lever E, electromagnet and armature-detent, the thrust-rod m interposed between the top of the weight and the under side of the latchlever, and a transmission medium subject for its movement to the action of the descending weight, substantially as described.

16. In a stop-motion, the combination with the grab-hook mechanism for the steam-ad mission valve thereof, of the character described, of a guard or cast-0ft member adjacent the normal path of oscillation of the grab-hook which is movably mounted, the weight, means for the suspension and means for effecting the liberation thereof, the lever F pivotally mounted adjacent the weight and having the arm 36 engaged by the weight, and the arm 37, and the rod G connecting said arm 37 with the movable support for said cast-off member, substantially as described.

17. The combination with the valve mechanism of an engine, of the character substantially as described, comprising the grab-hook, and the trip-ring, of a guard or cast-oft member normally located adjacent the path of oscillation of the grab-hook, and slightly distant from the edge of the trip-ring, a support on which it is mounted having compound movements whereby the guard is first moved toward the ring, and thereafter along the ring, a mechanism comprising a power element, electromagnetic devices controlling the same, and a medium of transmission connected between said power element and said movable support for the cast-o'lt device, for the purposes set forth.

18. The combination with the valve mechanism of an engine, substantially as described, of the fixed part having a curved slot 53, the bell-crank v pivotally mounted, the lever 17 also pivotally mounted above the said bellcrank, and having the lower extremity thereof formed with a journal opening therethrough, the tongue 57 having the stud 60 in bearing through said journal-opening, and having at its outer end the guard rod w adapted for cooperation as described, with the grab-hook, and said tongue being engaged with the bell-crank, a projection extended backwardly from said tongue in engagement through said slot 53, and mechanism for imparting a rocking motion to said bell-crank, for the purposes set forth.

19. The combination with the valve mechanism of an engine, substantially as described, of the pivotally-monnted lever 'v havingin its extremity the journal-opening, the tongue 57 having the stud 6O journaled through said opening in said part c, and having the castoff or guard-rod 10, means for imparting primarily an independent swinging motion of the tongue 57 whereby the guard-rod is presented in contact on the part of the valvegearing on which the grab-hook rides, and secondarily, a bodily movement of the tongue and guard-rod as constrained by the connected part r, substantially as described.

20. The combination with the valve mechanism of an engine, of the character described, comprising the governor-operated trip-ring crank Q and a stop-motion for the engine which is electromagnetically controlled comprising a contact member mounted adjacent the said crank and adapted to be contacted on thereby when such crank is excessively moved under an abnormal running of the engine, said crank and contact being connected in the stop-motion circuit, for the purpose set forth.

21. A speed-limit comprising the contact bar or blade 70, and a support therefor Whereby the same is mounted adjacent the tripring crank of the valve mechanism, said blade being adjustable forward and back in the direction of throw of said crank, and also adapted to be moved out of the path of its movement, said blade and crank being connected in a stop-motion circuit, for the purpose set forth.

22. The combination with the valve mechanism of an engine, of the kind shown, comprising the trip-ring crank, and with a stopmotion for the engine having electromagnetic controlling apparatus therefor, the speed-limit substantially as shown, comprising the upstanding rod 77 having member 76 vertically adjustable thereon, the rod 74: transversely the electric-circuit connection of said stopmotion for the engine.

Signed by me at Springfield, Massachusetts, this 28th day of July, 1899.

' HARRY F. CRIOKLER.

Witnesses: I

WM. S. BELLoWs, M. A. CAMPBELL. 

